Question about 1999 Chevrolet Silverado 1500

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What weight gear oil do i need 99 chevy Z71

I need to know what weight gear oil to use for rear differental on a 99 chevy 1500 siverado 1500

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  • Anonymous Apr 16, 2009

    when i start my truck there is a ticking sound, but once the engine is warm and on the road, the ticking sound goes away. i checked the oil and is at normal reading. im afraid it could be a push rod, or maybe the oil pump is going out. :(

  • Anonymous Mar 20, 2014

    are the planetary gears compatible? both from a np241 transfer case but mine is a 99 and the one I found is a 88-94 chevy Silverado. thanks

  • Anonymous Mar 29, 2014

    1999 weight of oil for accumulator

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I believe that it is 80w90 but you also have to add differential additive for locker that is inside. you can purchase additive at chevy dealership, napa, or other parts stores just make sure it is formulated for gm.

Posted on Dec 22, 2008

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1 Answer

I need to know what weight gear oil to use in the rear differental for a 99 chevy silverado 1500 Z71 4x4


There should be a tag on the rear that tells you the weight. It is probably sythetic oil. If there is no tag, call any Chevy dealer, ask for service dept. and they will tell you.

Dec 22, 2008 | 1999 Chevrolet Silverado 1500

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